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Roman55 [17]
3 years ago
12

Solve the quadratic by taking square roots.  Write your answer with no spaces as x=a,-a where a and -a are the values you found

when solving. 
    3x² - 7 = 140
​
Mathematics
1 answer:
Ilia_Sergeevich [38]3 years ago
3 0

Answer:

x=7,−7

Step-by-step explanation:

In order to find the value of x in this quadratic equation we first need to make the equation equal 0 by getting rid of the 140. We do this by subtracting 140 on each side.

3x² - 7 = 140

3x² - 147 = 0

Now we solve as a regular quadratic formula

x= x = \frac{-(0) +- \sqrt{0^{2} - 4(3)(-147) } }{2(3)}

x = \frac{0 +- \sqrt{1764} }{6}

x=7,−7

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Javier has a basket of oranges and apples. The number of oranges is 2 more than twice the number of apples in the basket. The di
Vesna [10]
Hello!

Let's put this into a system of equations and have a represent the apples and o represent the oranges.

o=2a+2
0.5o-0.5a=4

Since we can already so what o equals (2a+2) we will substitute it into the second equation and solve for a.

0.5(2a+2)-0.5a=4
1a+1-0.5a=4
1.5a+1=4
1.5a=3
a=2

Now that we know the value of a will put a into the first equation to find o.

o=2(2)+2
o=4+2
o=6

There were 6 oranges and 2 apples.

I hope this helps!
3 0
3 years ago
Please help me out with this math problem
Novosadov [1.4K]
Answer: 74.8%

This answer is approximate.
The value is rounded to the nearest tenth of a percent.

==========================================

Explanation:

Let,
X = area of the larger circle
Y = area of the smaller circle
Z = area of the shaded region = X - Y

The goal is to compute the ratio Z/X to get the answer we want

Let's find area of the larger circle
Area of circle = pi*(radius)^2
A = pi*r^2
X = pi*8.01^2
X = 64.1601pi
This is the exact area in terms of pi

Now repeat for the smaller circle
A = pi*r^2
Y = pi*4.02^2
Y = 16.1604pi

Subtract those results to find the value of Z
Z = X-Y
Z = 64.1601pi-16.1604pi
Z = 47.9997pi
This is the exact area of the red donut region

Divide Z over X to get the probability of landing in the red region
Z/X = (47.9997pi)/(64.1601pi)
Z/X = (47.9997)/(64.1601) <--- note how the pi terms cancel
Z/X = 0.74812 which is approximate

Convert to a percent
Move the decimal point 2 spots to the right
0.74812 ---> 74.812%

Then round this to one decimal place
74.812% ---> 74.8%

5 0
3 years ago
Dichlorosilane is a compound that contains silicone, hydrogen, and chlorine atoms.it has the chemical formula SIH2CI2. Which sta
bekas [8.4K]

Answer:

Step-by-step explanation:

6

4 0
3 years ago
Help please I’m having trouble
tangare [24]

Answer:

22

Step-by-step explanation:

6(3^2+2)=66

66/2= 22

8 0
3 years ago
Read 2 more answers
X is less than or equal to 1
levacccp [35]

Answer:

X is equal to 1, because for any other number x, 1*x = x. So, the reason that any number to the zero power is one is because any number to the zero power is just the product of no numbers at all.

5 0
4 years ago
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